"'Remember,' concluded he, 'that the solitary mortal is certainly luxurious, probably superstitious, and possibly mad: the mind stagnates for want of employment, grows morbid, and is extinguished like a candle in foul air.'"
— Piozzi, [née Salusbury; other married name Thrale] Hester Lynch (1741-1821)
Hester Lynch Piozzi, Anecdotes of the Late Samuel Johnson, L.L.D. During the Last Twenty Years of his Life (London: T. Cadell, 1786). <Link to ESTC><Link to Google Books>
See also Anecdotes of the Late Samuel Johnson, L.L.D. During the Last Twenty Years of his Life. 4th edition. (London: Cadell, 1786). <Link>